Concrete slab for walls or the like



F. G. LYNDE.

CONCRETE SLAB FOR WALLS OR'THE LIKE. APPLICATION FILED JULY 15,1919.

a b 51 L91 6 Patentedimg. 8, 1922. a v

FRANCIS GASGOIGNE LYND'E, OE BELVEDERE, ENGLAND.

CONCRETE SLAB FOB VIALLS OB THE LIKE.

insane.

' Application filed July 15,

To aZZ whom it may concern Be it known that I, FRAnois (ii'ASCOIGNELYNDE subject of the King of Great Britain, and resident of The Eaves,Picardy Hill, Belvedcre Kent, England have invented certain new anduseful Improvements Relating to Concrete Slabs for Wells or the like, ofwhich the following is specification.

This invention relates to concrete slabs for use in the erection ofwalls or the like and consists of an improvement in or modification ofthe invention described and claimed in the specification of applicationfor Letters Patent No. 311,0d9.

' In my aforesaid specification certain means are described foreffecting the verti cal junctions of reinforced concrete slabs but it isfound that when concrete slabs are formed with metallic connectorsprojecting from the edges thereof the said connectors are liable todeterioration owing to atmospheric influences during the storage of theslabs thus rendering difficult the joining of such slabs when requiredfor use in erecting a wall or other structure.

Now it is the chief object of the present invention to render thereinforced concrete slabs capable of being stored without risk of theattendant deterioration above referred to and to facilitatetheconnecting of such slabs when used in the erection of walls and otherstructures and to these ends and such others as may hereinafter appearor are incidental thereto the invention may be said to reside in aconstruction in which the slab is produced of the required dimensions bymoulding or otherwise with the reinforcement embedded therein andprovided with transverse holes or passages for the reception ofconnecting wires the said holes or openings being made in the concreteand through the meshing of the reinforcement. The holes or openings maybe drilled after the slabs have been moulded and dried or matured orthey may be roduced by moulding at the same time that the slabs aremoulded.

When the slabs are placed in position in the course of erecting astructure such as a wall the wires are threaded or passed through theholes and the ends which project on opposite sides of the slabs twistedor tied together. The joint is then covered with concrete and allowed toset or harden.

In order to obtain a smooth or plain surface joint there may be formedin the faces Epec-ifica'izion Letters Patent. Pgatnntgfi A s 8, 11%?22,

1919. Serial No. 311,050.

of the slab chases or grooves extending from or slightly beyond theholes or openings to the edges of the slabs. Thus when the aforesaidwires are inserted or passed in or through the holes they will, lie fora por" tion of their length in the chases or grooves and the knots ortwists will lie between the slabs so that no part of the wires projectbeyond the faces of the slabs. By these means a neat and very sightlyjoint is effected. The chases or grooves at their open ends may besplayed and deepened somewhat to receive the twist of wire.

In order that the invention may be readily understood and carried intoeffect I will now proceed to describe the same more fully with referenceto the accompanying drawings in which Figure l is a fragmentary viewshowing in side elevation portionsof two slabs at their verticaljunction and embodying the features of the present improvements.

Figure 2 is a corresponding horizontal section.

Fig. 3 is a view of a portion of the face of a slab showing a groove forthe connecting wires. and

Fig. 4C is a sectional elevation of a portion of a slab on line IV-JV.

The slab a is produced by. moulding or other suitable method theconcrete covering and enclosing the metal reinforcement 0. which iscompletely embedded therein. This reinforcement is preferably of ameshed construction usually the well known. expanded metal wire nettingor the like. The slabs are formed or provided either at the time ofmoulding or afterwards when the concrete has hardened or matured withtransverse holes or openings 6 for the reception of wires 0 whereby theslabs are connected at the vertical junctions. These holes are madethrough the slabs so as to traverse the meshes of the reinforcement.Thus when the said wires are passed through the holes Y) and their endstwisted or knotted together as at c the strain on the connecting wiresis distributed by the matured concrete of the slab over a large portionof the reinforcement. The exposed portions of the said connecting wiresare covered or encased in concrete as shown at (Z (Figure 2) theconcrete being run into the space between the edges of the slab as shownat 65 The said twisted or knotted ends of the wires may be housed inchases or grooves 6 crete.

(Figure 2) formed in the faces of the slabs a the said chases extendingfrom or slightly beyond the holes bto'the adjacent junction edges of theslabs. When the ends of the Wires 0 are twisted as'at 0 and 'laid inthechases or grooves a flush face joint is se cured the interstices beingfilled With congrooves as at 6 (Figure 2) provision may be made forreceiving the knot or twist 01 Wire Within the plane. of the slab. I

The .herein described improvements enablereinforced concrete slabs to beproduced Which, When joined by means of the .connecting Wires ensures avery strong and durable joint. The method of construction and joiningalso offers greatfacility for storing as the destruction or weakening byoxidation of the metallic connectors Whether the same are constituted asheretofore by sepa-v By splaying and deepening the grooves in the facesof the slabs to receive the Wires, and depressions in the adjacent endsof :the grooves i'n aoljacent slabs to house the knotted or twisted endsof the Wires. i e I c The combination of concrete slabs having metallicreinforcement embedded"therein, transverse passages Which traverse theconcrete and the reinforcement, connecting Wires in said passages .theends of Which are twisted or knotted together, groovesiin the facesofthe slabs to receive the Wires, and depressions in the adjacent .endsofthe grooves in adjacent slabs to house the knotted or twisted endsof theWires, .anda covering of concrete for said Wires. v

Concrete slabs having :Inetallic vreinforcement [embedded therein,transverse passages Which traverse the concrete and the reinforcementconnecting Wires in .sa'id passages the ends of which the twisted .or.

knottedtogether on both sides of the slabs grooves in'the faces of theslabstoreceive the twisted Wires arportion of the grooves being deepenedto receive one of the knots in the Wiresand a covering of concrete whichextends beyondthe faces of the slabs and encasesone of'the knotsrofWire.

Signed atELondon, Englancl, this 23rd day ofMay, A. D. 1919.

'F vANCIS GASGOIGNE LYNDE.

